18163+3625 HU 1291
18h 16m 16.75s +36° 25' 18.1" P.A. 52.00 sep 0.3 mag 9.30,10.00 Sp F5
| Coord 2000 |
18163+3625 |
|
Discov num |
HU 1291 |
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Comp |
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Coord arcsec 2000 |
18 16 16.75 +36 25 18.1 |
|
| Date first |
1905 |
|
Date last |
2016 |
|
Obs |
26 |
|
| Pa first |
337 |
|
Pa last |
52.4 |
|
P.A. Now (θ) |
52.4° |
|
| Sep first |
0.4 |
|
Sep last |
0.304 |
|
Sep. Now (ρ) |
0.304" |
|
| Mag pri |
9.30 |
|
Mag sec |
10.00 |
|
delta mag (ΔM) |
0.7 |
|
Spectral class |
F5 (yellow-white) |
|
| Pri motion ra |
+017 |
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Sec motion ra |
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| Pri motion dec |
-009 |
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Sec motion dec |
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| Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Lyra |
|
Tycho2 |
2634-00510-1 |
|
Gaia DR2 |
4605998558310229504 |
|
ADS |
11225 |
|
ORBITAL ELEMENTS
| Period (P) | 215.89y | |
Periastron (T) | 1988.75y | |
Semi-major axis (a) | 0.332a | |
| Eccentricity (e) | 0.683 | |
Inclination (i) | 147.4° | |
Longitude of periastron (ω) | 278° | |
| Node (Ω) | 92° | |
Notes | | |
Reference | Hrt2014b | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
84.3 |
0.179 |
| 2001 |
81.0 |
0.187 |
| 2002 |
77.9 |
0.195 |
| 2003 |
75.0 |
0.203 |
| 2004 |
72.3 |
0.210 |
| 2005 |
69.9 |
0.218 |
| 2006 |
67.6 |
0.225 |
| 2007 |
65.4 |
0.231 |
| 2008 |
63.3 |
0.238 |
| 2009 |
61.4 |
0.244 |
| 2010 |
59.5 |
0.251 |
| 2011 |
57.8 |
0.257 |
| 2012 |
56.1 |
0.263 |
| 2013 |
54.5 |
0.268 |
| 2014 |
53.0 |
0.274 |
| 2015 |
51.5 |
0.280 |
| 2016 |
50.1 |
0.285 |
| 2017 |
48.7 |
0.290 |
| 2018 |
47.4 |
0.295 |
| 2019 |
46.1 |
0.300 |
| 2020 |
44.9 |
0.305 |
| 2021 |
43.7 |
0.310 |
| 2022 |
42.5 |
0.314 |
| 2023 |
41.4 |
0.319 |
| 2024 |
40.3 |
0.323 |
| 2025 |
39.2 |
0.328 |
| 2026 |
38.2 |
0.332 |
| 2027 |
37.2 |
0.336 |
| 2028 |
36.2 |
0.340 |
| 2029 |
35.2 |
0.344 |
| 2030 |
34.3 |
0.348 |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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